By RYAN NAKASHIMA

Associated Press Writer

LAS VEGAS (AP) - O.J. Simpson was arrested Sunday, three days after police named him a suspect in an alleged armed robbery of collectors involving the former football great's sports memorabilia, authorities said.

Simpson was arrested shortly after 11 a.m., Capt. James Dillon said. Police were still determining charges.

Several police officers were seen entering the hotel where Simpson is staying. A security guard said police took Simpson out a side door shortly after they arrived.

At least one other person has been arrested and police said Sunday that as many as six people could be arrested in connection with the alleged armed robbery that occurred in a room inside the Palace Station casino-hotel on Thursday.

Simpson, 60, has said he and other people with him were retrieving items that belonged to him. Simpson has said there were no guns involved and that he went to the room at the casino only to get stolen mementos that included his Hall of Fame certificate and a picture of the running back with J. Edgar Hoover.

Simpson told The Associated Press on Saturday that he did not call the police to help reclaim the items because he has found the police unresponsive to him ever since his ex-wife, Nicole Brown Simpson, and her friend, Ron Goldman, were killed in 1994.

``The police, since my trouble, have not worked out for me,'' he said, noting that whenever he has called the police ``It just becomes a story about O.J.''

The Heisman Trophy winner, ex-NFL star and actor lives near Miami and has been a tabloid staple since his ex-wife and Goldman were killed in 1994. Simpson was acquitted of murder charges, but a jury later held him liable for the killings in a wrongful death lawsuit.

Police said two firearms and other evidence were seized at a private residence early Sunday.

Walter Alexander, 46, of Arizona, was arrested Saturday night on two counts of robbery with a deadly weapon, two counts of assault with a deadly weapon, conspiracy to commit robbery and burglary with a deadly weapon.

Besides the two firearms, police said they seized other evidence during early morning searches of two residences, Nichols said.

``It was evidence of a crime that was committed,'' Nichols said. ``And I believe we recovered some clothing that the individual was wearing in the commission of the robbery.''

Simpson said auction house owner Tom Riccio called him several weeks ago to say some collectors were selling some of his items. Riccio set up a meeting with collectors under the guise that he had a private collector interested in buying Simpson's items.

Simpson said he was accompanied by several men he met at a wedding cocktail party, and they took the collectibles.